Abstract
In this study, functional extension by connecting the different types of modular robots is discussed. The modular robots have to be connected each other in the structures, electric circuits and information systems automatically. Then the connector for the modular robots was designed here based on the tight lock coupler for railway vehicles. Two prototypes of the modular robot driven by two crawlers with the connector were also made. The robot composed of the two prototypes can move not only by four crawlers but also by four legs. Thus the robot with four crawlers can be the quadruped walking robot. This is an example of functional extension of the robot system by connecting the modular robots.
